v6 omc heads

[bigbluechevy454]

which omc heads are best for 150 johnson crossflow believe its about a 85 model got a buddy that has some 235 heads and a few other sets will these help the performance?

[EMDSAPMGR]

Check the year on the heads. The early 235 heads will bolt right on and are solid, high compression heads. 323872/873. Must be from the 1978 or 1979 engines. In 1980 they changed the 235 block to 160 cubic inches. Consider adding the intake filler blocks from the 200/235 also. Make sure you are running the 1 5/16" carbs on that 150. You may need to feed it a little more fuel by upping the high speed jet size slightly.

[bigbluechevy454]

thanks we ended up with some 200 heads i believe will get the number tomorrow they look like they would bump up the compression there a hump on the side of the combustion camber the stock heads dont have

[EMDSAPMGR]

Sounds like you have the low compression bathtub heads stock on the engine. The 200 heads are good, 323456/457. They were on the early 150/175/200. They will run in the 110 lbs compression range, the 235 heads-close to 120.